Thermography has proven to be one of the most effective approaches to detect cracks in conductive specimens over a relatively large area. Pulsed eddy current stimulated thermography is an emerging integrative nondestructive approach for the detection and characterization of surface and subsurface cracks. In this paper, heating behaviors of edge cracks, excited by pulsed eddy currents, are examined using numerical simulations. The simulations are performed using COMSOL multiphysics finite element method simulation software using the AC/DC module. The simulation results show that in the early heating stage, the temperature increases more quickly at the crack tip compared with other points on the sample. The results indicate that to maximize sensitivity, the response should be analyzed in the early stages of the heating period, no more than 100 ms for samples in which we are interested. The eddy current density distribution is changed with a variation in inductor orientation, but the crack tips remain the “hottest” points during the excitation period, which can be used for robust quantitative defect evaluation. Signal feature selection, transient temperature profile of the sample, and influence of the inductor orientation on the detection sensitivity for edge cracks are investigated. The work shows that positioning of the inductor, perpendicular to the crack line, results in the highest sensitivity for defect detection and characterization. The crack orientation can be estimated through the rotation of the linear inductor near the sample edge and the crack tips.
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e-mail: yangsuixian@scu.edu.cn
e-mail: g.y.tian@ncl.ac.uk
e-mail: i.m.zainal-abidin@ncl.ac.uk
e-mail: john.wilson2@ncl.ac.uk
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January 2011
Research Papers
Simulation of Edge Cracks Using Pulsed Eddy Current Stimulated Thermography
Suixian Yang,
Suixian Yang
Professor
School of Manufacturing Science and Engineering,
e-mail: yangsuixian@scu.edu.cn
Sichuan University
, Chengdu 610065, China
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Gui Yun Tian,
Gui Yun Tian
Professor
School of Electrical, Electronic and Computer Engineering,
e-mail: g.y.tian@ncl.ac.uk
Newcastle University
, NE1 7RU, UK
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Ilham Zainal Abidin,
Ilham Zainal Abidin
School of Electrical, Electronic and Computer Engineering,
e-mail: i.m.zainal-abidin@ncl.ac.uk
Newcastle University
, NE1 7RU, UK
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John Wilson
John Wilson
Research Assistant
School of Electrical, Electronic and Computer Engineering,
e-mail: john.wilson2@ncl.ac.uk
Newcastle University
, NE1 7RU, UK
Search for other works by this author on:
Suixian Yang
Professor
School of Manufacturing Science and Engineering,
Sichuan University
, Chengdu 610065, Chinae-mail: yangsuixian@scu.edu.cn
Gui Yun Tian
Professor
School of Electrical, Electronic and Computer Engineering,
Newcastle University
, NE1 7RU, UKe-mail: g.y.tian@ncl.ac.uk
Ilham Zainal Abidin
School of Electrical, Electronic and Computer Engineering,
Newcastle University
, NE1 7RU, UKe-mail: i.m.zainal-abidin@ncl.ac.uk
John Wilson
Research Assistant
School of Electrical, Electronic and Computer Engineering,
Newcastle University
, NE1 7RU, UKe-mail: john.wilson2@ncl.ac.uk
J. Dyn. Sys., Meas., Control. Jan 2011, 133(1): 011008 (6 pages)
Published Online: November 30, 2010
Article history
Received:
November 28, 2009
Revised:
July 18, 2010
Online:
November 30, 2010
Published:
November 30, 2010
Citation
Yang, S., Tian, G. Y., Abidin, I. Z., and Wilson, J. (November 30, 2010). "Simulation of Edge Cracks Using Pulsed Eddy Current Stimulated Thermography." ASME. J. Dyn. Sys., Meas., Control. January 2011; 133(1): 011008. https://doi.org/10.1115/1.4002710
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